Kaersutite
was named by Johannes Theodor Lorenzen (1855-1884),
Danish mineralogist interested in Greenland minerals, for the locality at Qaersut (Kaersut), Uummannaq, northern Greenland
where it was discovered in 1884.

Kaersutite is a rare
titanium bearing member of the Calcic Clino-Amphibole Subgroup
of the Amphibole Group of minerals that includes Actinolite,
Ferro-edenite, Kaersutite,
Pargasite,
Richterite and
Tremolite. The Amphibole Group is an extensive and complex group
of minerals currently divided into several sub-groups.
Kaersutite occurs in intermediate alkali igneous rocks
and is one of the rock-forming amphiboles typically
found in nepheline syenite. Crystals are commonly very dark
brown to black, well-formed, prismatic
phenocrysts to about 10 cm with vitreous luster.

Kaersutite
was named for the locality at Qaersut (Kaersut), Uummannaq, northern Greenland
where it was discovered in 1884.
It was named by Johannes Theodor Lorenzen (1855-1884),
Danish mineralogist interested in Greenland minerals.
Lorenzen died at age 29 while on an expedition to Greenland
in 1884. The mineral Lorenzenite was
named in his honor.

Kaersutite
is found In Greenland, from Østerfjeld, near Qaersut,
at Nûgssuaq, and elsewhere in the Kangerdlugssuaq Fjord
and Skaergaard areas; on Linosa, Pelagian Islands, south
of Sicily, Italy; from Vlcí Hora (Wolf Hill) , Cernošín,
Czech Republic; near Boulder Dam, Mohave County, and
near San Carlos, Gila County, Arizona, USA; Mont Saint-Hilaire,
Quebec, Canada; Chikaishi, Oki Island, Shimane Prefecture,
and at Mushozu and Numazu, Iki Island, Nagasaki Prefecture,
Japan; at Kakanui, New Zealand. A number of other localities
are known.

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